Crashes on video

[KB9]

Using 1.11.5 now and video crashing seems to be completely gone! Very robust feels stable. Thank you and congrats!

[musigreg]

any update on this problem? still crashes in cachyos.

could you try the beta version

Hey!

The Qt6 beta seems to have completely solved the issue on my system.

Here's some feedback after a few days of testing (GPT helped me enable Qt logging and compare the logs, but the observations below are from my own testing).

Environment
CachyOS (Arch Linux)
KDE Plasma
Wayland
NVIDIA GPU
Stable 1.11.5 (Qt5)

With the stable version, XnView would eventually crash to desktop after selecting ANY video files. I could reproduce it consistently.

The same video library plays fine in VLC, so the files themselves don't appear to be the problem.

Beta 1.11.3 (Qt6)

I tested with the exact same library (~600 mixed videos):

rapid video switching
seeking
window resizing
moving the window between monitors
thumbnail generation

So far, I haven't been able to reproduce the crash a single time.

Additional observations

While troubleshooting, I also forced the XCB backend (QT_QPA_PLATFORM=xcb). This revealed another interesting difference:

It didn't crash like the first test. Thumbnail generation is laggy and stops at some point... But selecting any kind of video files doesn't crash the app completely.
Also :
AUR package + XCB: video playback becomes green.
Official TGZ package + XCB: video playback becomes black.

These are rendering issues, not the original crash, but I thought they might still be useful.

Logs

Comparing the verbose logs, I noticed that:

Stable 1.11.5: Qt 5.15 with the older video pipeline.
Beta 1.11.3: Qt 6.10 + Qt Multimedia + FFmpeg 7.1.3, with CUDA/VAAPI hardware acceleration available.

I can't say that's the exact cause of the crash, but the Qt6 beta has been completely stable during my tests, so whatever changed in the video stack seems to have resolved it on my system.

Hope that helps!